Thinking about Mamoa, I started putting together a list of all the changes from the book in a pros/cons list:
Pros:
- Change Liet Kynes from father to mother of Chani. I think this will be more relatable to a modern movie audience and will probably be used to make Chani more blood thirsty in part 2.
- Removal of adult content. The movie is much better off omitting the more depraved aspects of the Harkonen appetites.
- No development of Emperor, Spacing Guild, Smugglers. This is for the best as the additional details would only confuse the story.
- Characters. Mamoa was very different from what I expected, but I loved his role. Paul's character in the book is often devoid of outward emotion - giving him an older brother figure to care for and lose lets him show his depth of feeling which would be largely lost in a screen translation. All the other characters were superb in their roles, especially Lady Jessica. Her finger movements and facial expressions convey her feelings in a direct way to the movie audience. I do wish the Baron was better developed - but that was 15 minutes extra I may be willing to watch that few others would.
Cons:
- No feyd rautha (yet). I wish they had included him in part 1, but it would've added another 10 min to the run time for introductions. I honestly believe his character will not be included in part 2 either.
- No significant speaking role for Piter. He's such a non entity in the movie. Again, it would take too much time to develop him properly.
- No banquet scene in Arakeen. It would've been better if they spent more time to develop the tension on Arakeen. In the book, there's so much space for tension building before the hammer falls. The banquet scene ties into the harvester scene as we learn of Harkonen treachery.